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# ViewTreeObserver.OnWindowFocusChangeListener

`public static interface ViewTreeObserver.OnWindowFocusChangeListener`
``

android.view.ViewTreeObserver.OnWindowFocusChangeListener

Interface definition for a callback to be invoked when the view hierarchy's window focus state changes.

## Summary

### Public methods
`abstract void` | `onWindowFocusChanged(boolean hasFocus)` Callback method to be invoked when the window focus changes in the view tree.

## Public methods

### onWindowFocusChanged

    public abstract void onWindowFocusChanged (boolean hasFocus)

Callback method to be invoked when the window focus changes in the view tree.

Parameters
`hasFocus` | `boolean`: Set to true if the window is gaining focus, false if it is losing focus.

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